Fix language error

Author: markdembo

src/content/docs/workflows/get-started/guide.mdx

@@ -159,7 +159,7 @@ name = "workflows-starter"
 binding = "MY_WORKFLOW"
 # this is class that extends the Workflow class in src/index.ts
 class_name = "MyWorkflow"
-# script_name is required during for the beta.
+# script_name is required during the beta.
 # Must match the "name" of your Worker at the top of wrangler.toml
 script_name = "workflows-starter"
 ```